feat(resources): add cross-server resource migration (dev-only) (#11165)

docs/dev-only-features.md

@@ -0,0 +1,23 @@
+# Development-only features
+
+Development-only features must only be available when `APP_ENV=local`. Use the
+`isDev()` helper consistently at every entry point so that hiding the UI is not
+the only protection.
+
+## Resource migration between servers
+
+Resource migration is under development and is not available in production.
+
+- **UI:** The **Migrate to another server** section in
+  `resources/views/livewire/project/shared/resource-operations.blade.php` is
+  rendered only when `isDev()` returns `true` and displays a **Dev** badge.
+- **API:** Application, database, and service migration requests are rejected
+  with `404 Not Found` outside development mode by
+  `migrateResourceToDestination()` in `bootstrap/helpers/api.php`.
+- **Action:** `MigrateResourceToDestination` rejects execution outside
+  development mode as a defense-in-depth check.
+- **Tests:** Development-mode UI, API access, and production isolation are
+  covered by `tests/Feature/MigrateResourceToDestinationTest.php`.
+
+Before promoting this feature, remove all three runtime gates together and
+update the tests and this document in the same change.